如何在不同编程语言中获取现在的Unix时间戳(Unix timestamp)

如何在不同编程语言中获取现在的Unix时间戳(Unix timestamp)？

Java	time
JavaScript	Math.round(new Date().getTime()/1000)getTime()返回数值的单位是毫秒
Microsoft .NET / C#	epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000
MySQL	SELECT unix_timestamp(now())
Perl	time
PHP	time()
PostgreSQL	SELECT extract(epoch FROM now())
Python	先 import time 然后 time.time()
Ruby	获取Unix时间戳：Time.now 或 Time.new 显示Unix时间戳：Time.now.to_i
SQL Server	SELECT DATEDIFF(s,'1970-01-01 00:00:00',GETUTCDATE())
Unix/Linux	date+%s
VBScript/ASP	DateDiff("s","01/01/1970 00:00:00",Now())
其他操作系统 (如果Perl被安装在系统中)	命令行状态：perl -e "print time"

如何在不同编程语言中实现Unix时间戳(Unix timestamp) → 普通时间？

Java	String date = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new java.util.Date(Unix timestamp * 1000))
JavaScript	先 var unixTimestamp = new Date(Unix timestamp*1000)然后commonTime = unixTimestamp.toLocaleString()
Linux	date -d @Unix timestamp
MySQL	from_unixtime(Unix timestamp)
Perl	先my $time = Unix timestamp然后my($sec,$min,$hour,$day,$month, $year) = (localtime($time))[0,1,2,3,4,5,6]
PHP	date('r', Unix timestamp)
PostgreSQL	SELECT TIMESTAMP WITH TIME ZONE 'epoch' + Unix timestamp) * INTERVAL '1 second';
Python	先 import time 然后 time.gmtime(Unix timestamp)
Ruby	Time.at(Unix timestamp)
SQL Server	DATEADD(s,Unix timestamp,'1970-01-01 00:00:00')
VBScript/ASP	DateAdd("s",Unix timestamp,"01/01/1970 00:00:00")
其他操作系统 (如果Perl被安装在系统中)	命令行状态：perl -e "print scalar(localtime(Unix timestamp))"

如何在不同编程语言中实现普通时间 → Unix时间戳(Unix timestamp)？

Java	long epoch = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").parse("01/01/1970 01:00:00");
JavaScript	var commonTime = new Date(Date.UTC(year,month -1,day,hour,minute,second))
MySQL	SELECT unix_timestamp(time) 时间格式: YYYY-MM-DD HH:MM:SS 或 YYMMDD 或 YYYYMMDD
Perl	先 use Time::Local 然后my $time = timelocal($sec,$min,$hour,$day,$month,$year);
PHP	mktime(hour,minute,second,day,month,year)
PostgreSQL	SELECT extract(epoch FROM date('YYYY-MM-DD HH:MM:SS'));
Python	先 import time 然后int(time.mktime(time.strptime('YYYY-MM-DD HH:MM:SS','%Y-%m-%d %H:%M:%S')))
Ruby	Time.local(year,month,day,hour,minute,second)
SQL Server	SELECT DATEDIFF(s,'1970-01-01 00:00:00',time)
Unix/Linux	date +%s -d"Jan 1, 1970 00:00:01"
VBScript/ASP	DateDiff("s","01/01/1970 00:00:00",time)